EP4064763A1 - Procédé et appareil d'itinérance, et système - Google Patents

Procédé et appareil d'itinérance, et système Download PDF

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Publication number
EP4064763A1
EP4064763A1 EP19958640.5A EP19958640A EP4064763A1 EP 4064763 A1 EP4064763 A1 EP 4064763A1 EP 19958640 A EP19958640 A EP 19958640A EP 4064763 A1 EP4064763 A1 EP 4064763A1
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EP
European Patent Office
Prior art keywords
plmn
terminal device
access
information
indication information
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19958640.5A
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German (de)
English (en)
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EP4064763A4 (fr
Inventor
Fangyuan ZHU
Yan Li
Jianning Liu
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Publication of EP4064763A1 publication Critical patent/EP4064763A1/fr
Publication of EP4064763A4 publication Critical patent/EP4064763A4/fr
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/06—De-registration or detaching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H04W8/12—Mobility data transfer between location registers or mobility servers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems

Definitions

  • Embodiments of this application relate to the field of communication technologies, and in particular, to a roaming method, an apparatus, and a system.
  • HPLMN Home Public Land Mobile Network
  • the terminal device cannot access the HPLMN
  • other operator networks may exist in an area in the HPLMN in which the fault occurs.
  • a roaming agreement may not be signed between these operator networks and the HPLMN.
  • a method for the terminal device to access the other operator networks is not provided in current technologies.
  • Embodiments of this application provide a roaming method, an apparatus, and a system, to enable, when a fault occurs in an HPLMN corresponding to a terminal device, the device to access another operator network in an area in which the fault occurs.
  • an embodiment of this application provides a roaming method, including: A terminal device accesses a second PLMN when the terminal device cannot access a first PLMN, where a dynamic roaming agreement between the second PLMN and the first PLMN is activated; the terminal device receives indication information from the second PLMN, where the indication information is used to indicate to deactivate the dynamic roaming agreement between the second PLMN and the first PLMN; and the terminal device sends an access request message to the first PLMN based on the indication information.
  • that the terminal device receives indication information from the second PLMN includes: The terminal device receives a broadcast message from the second PLMN, where the broadcast message includes the indication information.
  • the broadcast message further includes identification information of the first PLMN, and/or information of an area that is in the second PLMN and that the terminal device is not allowed to access.
  • the method further includes: The terminal device deregisters from the second PLMN
  • that the terminal device receives indication information from the second PLMN includes: The terminal device receives a deregistration request message from the second PLMN, where the deregistration request message includes the indication information.
  • the deregistration request message further includes information of an area that is in the second PLMN and that the terminal device is not allowed to access.
  • the method further includes: Before the terminal device accesses the second PLMN, the terminal device receives, from the second PLMN, indication information used to indicate to activate the dynamic roaming agreement between the second PLMN and the first PLMN
  • the method further includes: The terminal device obtains information of the second PLMN before the terminal device accesses the second PLMN
  • the information of the second PLMN further includes at least one of the following information: an access technology type by using which the terminal device is allowed to access the second PLMN, information of an area that is in the second PLMN and that the terminal device is allowed to access, or priority information of the second PLMN
  • an embodiment of this application provides a roaming method, including: A core network element in a second PLMN obtains first indication information when a terminal device cannot access a first PLMN, where the first indication information is used to indicate to activate a dynamic roaming agreement between the second PLMN and the first PLMN; and the core network element sends the first indication information to the terminal device.
  • a core network element obtains first indication information includes: The core network element obtains a first notification message, where the first notification message includes the first indication information.
  • the first notification message further includes information of the first PLMN, and the information of the first PLMN includes identification information of the first PLMN
  • the first notification message further includes at least one of the following information: an access technology type by using which the terminal device is allowed to access the second PLMN, information of an area that is in the second PLMN and that the terminal device is allowed to access, or priority information of the second PLMN
  • the method further includes: The core network element determines an access network device based on the information of the area that is in the second PLMN and that the terminal device is allowed to access, where the access network device is located in the area that is in the second PLMN and that the terminal device is allowed to access.
  • the core network element is an access management network element
  • that the core network element obtains a first notification message includes: The access management network element obtains the first notification message from a network management network element by using a network exposure function network element in the second PLMN
  • the method further includes: The core network element obtains second indication information, where the second indication information is used to indicate to deactivate the dynamic roaming agreement between the second PLMN and the first PLMN; and the core network element sends the second indication information to the terminal device by using the access network device.
  • an embodiment of this application provides a communication apparatus, including: a processing unit, configured to enable the communication apparatus to access a second PLMN when the communication apparatus cannot access a first PLMN, where a dynamic roaming agreement between the second PLMN and the first PLMN is activated; a receiving unit, configured to receive indication information from the second PLMN, where the indication information is used to indicate to deactivate the dynamic roaming agreement between the second PLMN and the first PLMN; and a sending unit, configured to send an access request message to the first PLMN based on the indication information.
  • the communication apparatus may be a terminal device.
  • an embodiment of this application provides a communication apparatus, including: a receiving unit, configured to obtain first indication information when a terminal device cannot access a first PLMN, where the first indication information is used to indicate to activate a dynamic roaming agreement between a second PLMN and the first PLMN, and the communication apparatus is an apparatus in the second PLMN; and a sending unit, configured to send the first indication information to the terminal device.
  • the receiving unit is configured to obtain a first notification message, where the first notification message includes the first indication information.
  • the first notification message further includes information of the first PLMN, and the information of the first PLMN includes identification information of the first PLMN
  • the first notification message further includes at least one of the following information: an access technology type by using which the terminal device is allowed to access the second PLMN, information of an area that is in the second PLMN and that the terminal device is allowed to access, or priority information of the second PLMN
  • the communication apparatus further includes a processing unit, configured to determine an access network device based on the information of the area that is in the second PLMN and that the terminal device is allowed to access, where the access network device is located in the area that is in the second PLMN and that the terminal device is allowed to access.
  • the receiving unit is configured to obtain the first notification message from a network management network element by using a network exposure function network element in the second PLMN
  • the receiving unit is further configured to obtain second indication information, where the second indication information is used to indicate to deactivate the dynamic roaming agreement between the second PLMN and the first PLMN; and the sending unit is further configured to send the second indication information to the terminal device by using the access network device.
  • the communication apparatus may be a core network element, for example, an access management network element.
  • the second PLMN and the first PLMN have a same mobile country code, and a mobile network code of the second PLMN is different from a mobile network code of the first PLMN
  • the dynamic roaming agreement between the second PLMN and the first PLMN includes: if the terminal device can access the first PLMN, a roaming agreement between the second PLMN and the first PLMN is deactivated; if the terminal device cannot access the first PLMN, a roaming agreement between the second PLMN and the first PLMN is activated.
  • the first PLMN is a home public land mobile network HPLMN
  • the second PLMN is a visited public land mobile network VPLMN
  • this application provides a communication apparatus, including a processor.
  • the processor reads computer-readable instructions stored in a memory, to enable the communication apparatus to perform the method in any one of the first aspect or the possible implementations of the first aspect.
  • this application provides a communication apparatus, including a processor.
  • the processor reads computer-readable instructions stored in a memory, to enable the communication apparatus to perform the method in any one of the second aspect or the possible implementations of the second aspect.
  • this application provides a communication system.
  • the communication system includes the communication apparatus in the fourth aspect or the sixth aspect and an access network device connected to the communication apparatus.
  • the communication apparatus communicates with a terminal device by using the access network device.
  • this application provides a computer-readable storage medium, including computer-readable instructions.
  • the instructions When the instructions are run on a computer, the computer is enabled to perform the method in the first aspect or the second aspect.
  • this application provides a computer program product, including a computer program.
  • the program When the program is run on a computer, the computer is enabled to perform the method in the first aspect or the second aspect.
  • this application provides a chip or a chip system.
  • the chip or the chip system includes at least one processor and a communication interface.
  • the communication interface is coupled to the at least one processor.
  • the processor is configured to run a computer program or instructions, to perform the method in any one of the first aspect or the possible implementations of the first aspect.
  • the communication interface is configured to communicate with a module other than the chip.
  • words such as “first” and “second” are used in embodiments of this application to distinguish similar content.
  • a first PLMN and a second PLMN are merely intended to distinguish different PLMNs, but not to limit a sequential order thereof.
  • a person skilled in the art may understand that the words such as “first” and “second” do not limit a quantity and an execution sequence, and the words such as “first” and “second” do not indicate a definite difference.
  • a network architecture and a service scenario described in embodiments of this application are intended to describe the technical solutions in embodiments of this application more clearly, and do not constitute a limitation on the technical solutions provided in embodiments of this application.
  • a person of ordinary skill in the art may know that with evolution of the network architecture and emergence of a new service scenario, the technical solutions provided in embodiments of this application are also applicable to similar technical problems.
  • At least one refers to one or more, and "a plurality of' refers to two or more.
  • the term “and/or” describes an association relationship between associated objects and represents that three relationships may exist.
  • a and/or B may represent the following cases: Only A exists, both A and B exist, and only B exists, where A and B may be singular or plural.
  • a character “/” generally indicates an “or” relationship between the associated objects.
  • At least one item (piece) of the following” or a similar expression thereof indicates any combination of the items, including any combination of singular items (pieces) or plural items (pieces).
  • At least one of a, b, or c may indicate: a, b, c, a and b, a and c, b and c, or a, b, and c, where a, b, and c may be singular or plural.
  • a terminal device In a communication network, to obtain a service provided by a network, a terminal device needs to select a PLMN, camp on an appropriate cell, and successfully complete a registration process. Based on an operation mode, PLMN selection may be classified into two manners: an automatic mode and a manual mode.
  • the automatic mode is that the terminal device automatically attempts selection from a PLMN with the highest priority based on priority ranks of PLMNs in a PLMN list. If the attempt succeeds, the terminal device selects an appropriate cell in the PLMN to camp on. If selection of a PLMN with a high priority fails, the terminal device attempts to select a PLMN with a secondary priority until the terminal device can successfully register with a PLMN
  • the manual mode is that the terminal device presents a list of currently available PLMNs (for example, presented according to priority ranks) to a user, and the user selects an appropriate PLMN from the list of PLMNs to access.
  • a list of currently available PLMNs for example, presented according to priority ranks
  • prior information-based PLMN selection and initial PLMN selection may be classified based on whether prior information exists.
  • the prior information-based PLMN selection means that the terminal device records a PLMN (Registered PLMN, RPLMN) with which the terminal device registers most recently (for example, currently). When powered on next time or returning to a coverage area, the terminal device selects the RPLMN with the highest priority. If the RPLMN is unavailable, the terminal device selects a PLMN using an initial selection method.
  • PLMN Registered PLMN, RPLMN
  • the initial PLMN selection is that the terminal device selects a PLMN based on various PLMNs and priorities thereof that are recorded in a universal subscriber identity module (Universal Subscriber Identity Module, USIM) when not having the prior information.
  • these PLMNs may be ranked in descending order based on the following priorities: (1) an HPLMN; (2) an equivalent HPLMN (Equivalent HPLMN, EHPLMN); (3) a user controlled PLMN (User Controlled PLMN); (4) an operator controlled PLMN (Operator Controlled PLMN); (5) a PLMN selected based on a quality of service requirement; and (6) another PLMN.
  • a universal subscriber identity module Universal Subscriber Identity Module
  • the user controlled PLMN means that the user of the terminal device may select a corresponding PLMN based on preference.
  • the operator controlled PLMN means that when producing a SIM, an operator stores a PLMN of another operator that has signed a roaming agreement with the operator in the SIM of the terminal device, and the terminal device may select, based on the stored PLMN, a corresponding PLMN to access.
  • the PLMN selected based on the quality of service requirement may be indication information used to indicate the terminal device to select a corresponding PLMN based on the quality of service requirement, for example, select a network with a reference signal received power (Reference Signal Received Power, RSRP) not less than -110 dBm. If none of the PLMNs in (1) to (5) can be accessed, the terminal device may select another PLMN that can be accessed.
  • RSRP Reference Signal Received Power
  • these PLMNs are set by the terminal device as PLMNs that are forbidden from being accessed. For example, if the terminal device receives cause information of a PLMN not allowed "PLMN not allowed", the terminal device adds the PLMN to a forbidden PLMN "forbidden PLMN" list in a SIM.
  • a terminal device of an operator fails to access a PLMN of another operator that does not sign the roaming agreement, and the terminal device adds the failed PLMN to the forbidden PLMN list.
  • the terminal device is in an automatic network selection mode, the terminal device shall not attempt to access any PLMN in the forbidden PLMN list subsequently. If the user manually attempts to access the PLMN subsequently and registration succeeds, the terminal device deletes the PLMN from the forbidden PLMN list.
  • the automatic network selection mode or the manual network selection mode once the forbidden PLMN list is generated, even if the terminal device is powered off or a SIM card is removed, a PLMN in the forbidden PLMN list is not automatically deleted.
  • FIG. 1 is a schematic diagram of a scenario to which an embodiment of this application is applicable.
  • the terminal device may access a second PLMN based on a dynamic roaming agreement between the first PLMN and the second PLMN
  • the first PLMN is an HPLMN
  • the second PLMN is a visited public land mobile network (Visited Land Mobile Network, VPLMN).
  • VPLMN Visitd Land Mobile Network
  • the first PLMN and the second PLMN have a same mobile country code (Mobile Country Code, MCC), and a mobile network code (Mobile Network Code, MNC) of the first PLMN is different from a mobile network code of the second PLMN
  • MCC Mobile Country Code
  • MNC Mobile Network Code
  • a fault occurs in the PLMN may mean that the fault occurs in an area that is in the PLMN and in which the terminal device is located, and does not necessarily mean that the fault occurs in the entire PLMN
  • FIG. 2 is a schematic diagram of a 5G network to which an embodiment of this application is applicable.
  • the 5G network in FIG. 2 uses a service-based network architecture.
  • Another 5G network architecture may also be used in embodiments of this application. This is not limited herein.
  • the 5G network architecture shown in FIG. 2 includes an access network (access network, AN) node and a plurality of network function (network function, NF) network elements.
  • the plurality of NF network elements may include: a user plane function (user plane function, UPF) network element, an access and mobility management function (access and mobility management function, AMF) network element, a session management function (session management function, SMF) network element, a policy control function (policy control function, PCF) network element, a network slice selection function (network slice selection function, NSSF) network element, a unified data management (unified data management, UDM) network element, a network repository function (network repository function, NRF) network element, a network exposure function (network exposure function, NEF) network element, a data storage function network element (unified data repository, UDR), a network management network element, or the like.
  • the network architecture may further include a terminal device, a data network (data network, DN) node, an application function (application function,
  • the network management network element may be an operation administration and maintenance (Operation Administration and Maintenance, OAM) system.
  • OAM Operaation Administration and Maintenance
  • the OAM system may communicate with another NF network element by using the NEF network element.
  • the OAM system may directly communicate with another NF network element. This is not limited in embodiments of this application.
  • Each network element in FIG. 2 may be a network element in a hardware device, may be a software function running on dedicated hardware, or may be a virtualization function instantiated on a platform (for example, a cloud platform).
  • network elements included in the entire network architecture are described as only examples. In embodiments of this application, the network elements included in the network architecture are not limited. For example, in embodiments of this application, the network architecture may include any one or more of all the network elements shown in FIG. 2 .
  • the terminal device is an electronic device having a wireless communication function, and may be deployed on land, including an indoor device, an outdoor device, a handheld device, or a vehicle-mounted device; or may be deployed on a water surface (such as a ship); or may be deployed in air (for example, on aircraft, a balloon, or a satellite).
  • the terminal device may be user equipment (user equipment, UE), a mobile phone (mobile phone), a pad (pad), a computer having a wireless transceiver function, a virtual reality (virtual reality, VR) terminal device, an augmented reality (augmented reality, AR) terminal device, a wireless terminal device in industrial control (industrial control), a wireless terminal device in self driving (self driving), a wireless terminal device in remote medical (remote medical), a wireless terminal device in a smart grid (smart grid), a wireless terminal device in transportation safety (transportation safety), a wireless terminal device in a smart city (smart city), a wireless terminal device in a smart home (smart home), or the like.
  • the AN node may be a device providing wireless access for the UE, and includes but is not limited to an evolved NodeB (evolved NodeB, eNB for short), a wireless-fidelity access point (wireless-fidelity access point, Wi-Fi AP for short), a worldwide interoperability for microwave access base station (worldwide interoperability for microwave access base station, WiMAX BS for short), a base station (such as a gNodeB or a gNB) in a 5G network, or the like.
  • the AN node may be a (radio access network, RAN) node or an access node in a subsequently evolved network.
  • the UPF network element may process a packet.
  • the UPF may perform functions such as user data forwarding, routing, data statistics collection, rate limiting, and statistics reporting.
  • the AMF network element may perform mobility management in a mobile network, for example, user location update, user network registration, and user handover.
  • the AMF network element may access non-access stratum (non-access stratum, NAS) signaling (including session management (session management, SM) signaling) of the UE through an N1 interface, or may access RAN signaling through an N2 interface, to complete a user registration procedure, SM signaling forwarding, and mobility management.
  • NAS non-access stratum
  • SM session management
  • the AMF network element may forward a message between the SMF network element and the UE.
  • the SMF network element may perform session management, such as session establishment, session modification, and session release, in the mobile network.
  • the PCF network element may manage a user policy, including a mobility-related policy and a protocol data unit (Protocol Data Unit, PDU) session-related policy, such as a quality of service (quality of service, QoS) policy and a charging policy.
  • a mobility-related policy including a mobility-related policy and a protocol data unit (Protocol Data Unit, PDU) session-related policy, such as a quality of service (quality of service, QoS) policy and a charging policy.
  • PDU Protocol Data Unit
  • QoS quality of service
  • the NSSF network element is used to select a network slice (network slice).
  • the network slice is a logically isolated network used for supporting a specific network capability and network feature, and may include an entire network in an end-to-end (end-to-end, E2E) manner, or some network functions may be shared by a plurality of network slices.
  • the network slice is a key technology for meeting differentiated requirements of a network in a fifth 5G mobile communication technology proposed by 3GPP.
  • network features of different network slices are different, and the network slices need to be isolated from each other to prevent mutual interference.
  • a network slice of an augmented reality (augmented reality, AR) service or a virtual reality (virtual reality, VR) service requires high bandwidth and a low delay.
  • a network slice of an internet of things (internet of things, IoT) service requires support of access of massive terminals, but requires low bandwidth and has no requirement on a delay.
  • the UDM network element is responsible for managing information such as user subscription data, and the UDM network element may provide the user subscription data for a network element such as the AMF and the SMF.
  • the UDR network element stores structured data of a network, including user subscription data information and a user policy.
  • the UDM may read terminal subscription data from the UDR, and the PCF may read user policy information from the UDR.
  • the UDR may also be divided into two parts, to be respectively combined with the UDM network element and the PCF network element, and is not independently deployed.
  • the NRF network element stores registration information of another function network element, and provides, based on the registration information, a service of searching and discovering each other between network function network elements.
  • the NEF network element is responsible for authorizing and controlling an exposure service and capability of a network.
  • An AF network element located outside an operator network may provide network data for the network by using the NEF network element, or may obtain the exposure service and data of the network by using the NEF.
  • the DN is used to provide a data service for the UE, and may be an access destination of a PDU session of the user.
  • the DN may be a PDN network such as Internet (internet) or an IP multimedia service (IP multimedia Service, IMS).
  • IP multimedia Service IP multimedia Service
  • the AF network element may send a request to affect a routing policy of the SMF, and is responsible for selecting and relocating an application in the local DN.
  • the AF mainly performs a dynamic policy or charging control on forwarding plane behavior.
  • the services need the dynamic policy and the charging control.
  • the AF transmits dynamic session information required by the PCF.
  • both the first PLMN and the second PLMN may use the architecture shown in FIG. 2 .
  • the first PLMN and the second PLMN may also use another network architecture, for example, an evolved packet core network (Evolved Packet Core network, EPC) architecture or a future evolved system architecture. This is not limited herein.
  • EPC evolved Packet Core network
  • FIG. 3 is a schematic diagram of a roaming method according to an embodiment of this application.
  • the roaming method includes the following steps.
  • a core network element in a second PLMN obtains first indication information when a terminal device cannot access a first PLMN, where the first indication information is used to indicate to activate a dynamic roaming agreement between the first PLMN and the second PLMN
  • the dynamic roaming agreement exists between the first PLMN and the second PLMN.
  • that the dynamic roaming agreement exists between the first PLMN and the second PLMN includes: if the terminal device can access the first PLMN, a roaming agreement between the first PLMN and the second PLMN is deactivated; if the terminal device cannot access the first PLMN, a roaming agreement between the first PLMN and the second PLMN is activated.
  • the first PLMN may be an HPLMN of the terminal device
  • the second PLMN may be a VPLMN of the terminal device.
  • that a roaming agreement between the first PLMN and the second PLMN is deactivated may mean that no roaming agreement exists between the first PLMN and the second PLMN, or the roaming agreement between the first PLMN and the second PLMN is unavailable.
  • that a roaming agreement between the second PLMN and the first PLMN is activated may mean that the roaming agreement exists between the first PLMN and the second PLMN, or the roaming agreement between the first PLMN and the second PLMN is available.
  • a temporary roaming agreement exists between the first PLMN and the second PLMN, and if the terminal device can access the first PLMN, the temporary roaming agreement is invalid, if the terminal device cannot access the first PLMN, the temporary roaming agreement is valid.
  • that the dynamic roaming agreement exists between the first PLMN and the second PLMN includes: if a first condition is satisfied, the roaming agreement between the first PLMN and the second PLMN is valid.
  • the first condition may be that a faulty occurs in the first PLMN, or the terminal device cannot access the first PLMN
  • the dynamic roaming agreement may also be referred to as the temporary roaming agreement. This is not limited in this application.
  • the core network element is an access management network element.
  • the access management network element may be an AMF network element.
  • the access management network element may be a mobility management entity (mobility management entity, MME).
  • MME mobility management entity
  • the core network element in the second PLMN obtains a first notification message, where the first notification message includes the first indication information.
  • the AMF network element may obtain the first notification message from a network management network element (for example, an OAM network element) by using a network exposure function network element in the second PLMN.
  • the AMF network element may directly obtain the first notification message from the OAM network element. This is not limited in this embodiment of this application.
  • an OAM system of the first PLMN may send an indication message to an OAM system of the second PLMN 2, to indicate to activate the dynamic roaming agreement between the first PLMN and the second PLMN.
  • the dynamic roaming agreement between the first PLMN and the second PLMN may be activated by the second PLMN. For example, when the second PLMN learns that the fault occurs in the first PLMN, the OAM system of the second PLMN determines to activate the dynamic roaming agreement between the first PLMN and the second PLMN
  • the first notification message further includes information of the first PLMN.
  • the information of the first PLMN may include identification information of the first PLMN.
  • the terminal device can determine the PLMN that has the dynamic roaming agreement with the second PLMN.
  • the identification information of the first PLMN may be an identifier (identify, ID) of the first PLMN
  • the first notification message further includes information of an area that is in the second PLMN and that the terminal device is allowed to access.
  • the information of the area may be a tracking area (Tracking Area, TA) identifier list (TA list), and the list includes one or more tracking area identifiers.
  • the information of the area may be information of an area, in an area that is in the first PLMN and in which a fault occurs, in the second PLMN that the terminal device is allowed to access the second PLMN. It may be understood that there is an overlapping area between the area that is in the second PLMN and that the terminal device is allowed to access the second PLMN and the area that is in the first PLMN and in which the fault occurs. In this way, a terminal device located in the area that is in the first PLMN and in which the fault occurs may be allowed to access the second PLMN without moving, thereby improving service experience of the terminal device.
  • the first notification message may further include policy information by using which the terminal device accesses the second PLMN.
  • the policy information includes at least one of the following information: an access technology type by using which the terminal device is allowed to access the second PLMN and priority information of the second VPLMN.
  • the priority information of the second PLMN may be understood as a priority of accessing the second PLMN by the terminal device or a rank of accessing the second PLMN by the terminal device in a plurality of PLMNs that the terminal device sequentially attempts to access.
  • the priority information of the second PLMN may alternatively be referred to as a priority of the second PLMN in a network selection list of the terminal device. This is not limited herein.
  • the access technology type by using which the terminal device is allowed to access the second PLMN includes a 3rd generation partnership project (3rd Generation Partnership Project, 3GPP) access technology and/or a non-3GPP (Non-3GPP) access technology.
  • 3GPP 3rd generation partnership project
  • Non-3GPP non-3GPP
  • the priority information of the second PLMN includes that a priority of the second PLMN is lower than a priority of any one of the following PLMNs: a priority of the first PLMN, a priority of an equivalent PLMN (Equivalent PLMN, EPLMN) of the first PLMN, a priority of a user controlled PLMN (User Controlled PLMN), and a priority of an operator controlled PLMN (Operator Controlled PLMN).
  • a network selection rank of the terminal device is: (1) the first PLMN, (2) the equivalent PLMN of the first PLMN, (3) the user controlled PLMN, (4) the operator controlled PLMN, and (5) the second PLMN. That is, when the terminal device sequentially attempts to access: (1) the first PLMN, (2) the equivalent PLMN of the first PLMN, (3) the user controlled PLMN, and (4) the operator controlled PLMN, but the access fails, the terminal device may attempt to access the second PLMN
  • the priority information of the second PLMN includes that the priority of the second PLMN is higher than a priority of a PLMN selected by a user based on a quality of service requirement, or the priority of the second PLMN is lower than a priority of the operator controlled PLMN and higher than a priority of a PLMN selected by a user based on a quality of service requirement.
  • the terminal device may attempt to access the second PLMN. If the terminal device cannot access the second PLMN, the terminal device may attempt to access the PLMN selected by the user based on the quality of service requirement.
  • the priority information of the second PLMN may further include priorities of the plurality of second PLMNs.
  • the core network element sends the first indication information to the terminal device.
  • the core network element determines an access network device based on the information of the area that is in the second PLMN and that the terminal device is allowed to access.
  • the access network device is located in the area that is in the second PLMN and that the terminal device is allowed to access.
  • the core network element sends the first indication information to the terminal device by using the determined access network device. For example, if the area that is in the second PLMN and that the terminal device is allowed to access includes a plurality of access network devices, the plurality of access network devices may simultaneously send broadcast messages to the terminal device.
  • the access network device sends the broadcast message to the terminal device.
  • the broadcast message includes the first indication information.
  • the broadcast message may further include the identification information of the first PLMN. In this way, the terminal device can determine the PLMN that has the dynamic roaming agreement with the second PLMN
  • the broadcast message further includes the information of the area that is in the second PLMN and that the terminal device is allowed to access.
  • the information of the area refer to the descriptions of 301.
  • the broadcast message may further include policy information by using which UE accesses the second PLMN.
  • policy information refer to the descriptions of 301.
  • the terminal device accesses the second PLMN
  • the terminal device accesses the second PLMN based on the first indication information.
  • the terminal device may determine the first PLMN as an HPLMN based on the identification information of the first PLMN included in the broadcast message. Then, the terminal device sends an access request message to the second PLMN based on the first indication information.
  • the access request message may be a registration request (registration request) message.
  • the terminal device sends the access request message to the second PLMN based on the received policy information by using which the second PLMN is accessed. For example, the terminal device determines, based on the policy information, an access technology to be selected to send the access request message to the second PLMN. For another example, the terminal device determines the priority of the second PLMN based on the policy information, and then sends the access request message to the second PLMN based on the priority of the second PLMN
  • the terminal device may access the second PLMN
  • the following operations 304 to 306 may be performed to enable the terminal device to re-access the first PLMN
  • the core network element in the second PLMN obtains second indication information, where the second indication information is used to indicate to deactivate the dynamic roaming agreement between the second PLMN and the first PLMN
  • the core network element in the second PLMN obtains a second notification message, where the second notification message includes the second indication information.
  • a manner that the core network element obtains the second notification message is similar to a manner that the core network element obtains the first notification message. For details, refer to the descriptions of 301.
  • the OAM system of the first PLMN may send the indication message to the OAM system of the second PLMN, to indicate to deactivate the dynamic roaming agreement between the first PLMN and the second PLMN.
  • the dynamic roaming agreement between the first PLMN and the second PLMN may be deactivated by the second PLMN. For example, when the second PLMN learns that the fault in the first PLMN is recovered, the OAM system of the second PLMN determines to deactivate the dynamic roaming agreement between the first PLMN and the second PLMN
  • the second notification message further includes the information of the first PLMN
  • the information of the first PLMN may include the identification information of the first PLMN. In this way, the terminal device may determine that the terminal device cannot dynamically roam to the second PLMN
  • the second notification message further includes information of an area that is in the second PLMN and that the terminal device is not allowed to access.
  • the information of the area may be a tracking area identifier list (TA list), and the list includes one or more tracking area identifiers.
  • the information of the area may be information of an area that is in the second PLMN and that the terminal device is not allowed to access the second PLMN after the fault in the first PLMN is recovered.
  • the information of the area that is in the second PLMN and that the terminal device is allowed to access the second PLMN in step 302 may be completely the same as, partially the same as, or completely different from the information of the area that is in the second PLMN and that the terminal device is not allowed to access in step 304.
  • the area that is in the second PLMN and that the terminal device is allowed to access the second PLMN is referred to as a first area, and the first area includes a first tracking area identifier list; and the area that is in the second PLMN and that the terminal device is not allowed to access is referred to a second area, and the second area includes a second tracking area identifier list.
  • One or more tracking area identifiers in the first tracking area identifier list may be completely the same as, partially the same as, or completely different from one or more tracking area identifiers in the second tracking area identifier list. This is not limited in the present invention.
  • the core network element sends the second indication information to the terminal device.
  • the core network element determines an access network device based on the information of the area that is in the second PLMN and that the terminal device is not allowed to access.
  • the access network device is located in the area that is in the second PLMN and that the terminal device is not allowed to access.
  • the core network element sends the second indication information to the terminal device by using the determined access network device.
  • the core network element sends the second indication information to the access network device.
  • the access network device may send the second indication information to the terminal device in the following two manners.
  • the access network device sends the broadcast message to the terminal device.
  • the broadcast message includes the second indication information. Further, the broadcast message may further include the identification information of the first PLMN.
  • the terminal device may determine the first PLMN as an HPLMN based on the identification information of the first PLMN. In this way, the terminal device may determine that the terminal device cannot dynamically roam to the second PLMN
  • the plurality of access network devices may simultaneously send broadcast messages to the terminal device.
  • the broadcast message further includes the information of the area that is in the second PLMN and that the terminal device is not allowed to access.
  • the information of the area may be a tracking area identifier list (TA list), and the list includes one or more tracking area identifiers.
  • TA list tracking area identifier list
  • the terminal device After receiving the broadcast message, the terminal device sends a deregistration request (deregistration request) message to the second PLMN, to enable the terminal device to deregister from the second PLMN
  • the access network device sends a deregistration request message to the terminal device.
  • the deregistration request message includes the second indication information.
  • the deregistration request message further includes the information of the area that is in the second PLMN and that the terminal device is not allowed to access. For details, refer to the descriptions of Manner 1.
  • the terminal device accesses the first PLMN
  • the terminal device sends an access request message to the first PLMN based on the second indication information, to access the first PLMN.
  • the access request message may be a registration request message.
  • the terminal device if the terminal device cannot access the first PLMN because a fault occurs in the first PLMN, the terminal device sends an access request to the second PLMN based on the first indication information from the second PLMN, to reduce service waiting time of the terminal device, and improve service experience of a user. Further, after the fault in the first PLMN is recovered, the terminal device sends an access request to the first PLMN based on the second indication information from the second PLMN, to enable the terminal device to return to the first PLMN in time.
  • the following describes the roaming method in this embodiment of this application in detail by using an example in which the first PLMN is an HPLMN, the second PLMN is a VPLMN, and the terminal device is UE.
  • the HPLMN includes an access network device RAN 1 and an access management network element AMF 1.
  • the VPLMN includes an access network device RAN 2, an access management network element AMF 1, an NEF network element, and an OAM network element.
  • the HPLMN and the VPLMN may alternatively include other network elements. This is not limited herein.
  • the VPLMN when a fault occurs in the HPLMN, the VPLMN enables dynamic roaming agreement with the HPLMN. Specifically, the method includes the following steps.
  • the UE cannot access the HPLMN
  • the OAM network element After the UE initially accesses the HPLMN, the UE cannot access the HPLMN if the fault occurs in the HPLMN 402.
  • the OAM network element sends first indication information to the NEF network element.
  • the VPLMN When the VPLMN learns that the HPLMN cannot be accessed due to the fault, the VPLMN activates the dynamic roaming agreement between the VPLMN and the HPLMN, to allow the UE in the HPLMN to access the VPLMN.
  • the OAM network element in the VPLMN obtains a first notification message by using a third party or directly from the HPLMN, and sends the first notification message to the NEF network element.
  • the first notification message includes the first indication information.
  • the first indication information is used to indicate to activate the dynamic roaming agreement between the HPLMN and the VPLMN.
  • the first notification message may further include identification information of the HPLMN.
  • the VPLMN to which the UE is allowed to roam can be determined by using the identification information of the HPLMN
  • the first notification message further includes information of an area that is in the VPLMN and that the terminal device is allowed to access, and/or policy information by using which the UE accesses the VPLMN.
  • information of the area that is in the VPLMN and that the terminal device is allowed to access and the policy information by using which the UE accesses the VPLMN refer to the information of the area that is in the second PLMN and that the terminal device is allowed to access and the policy information by using which the UE accesses the second PLMN in 301.
  • the NEF network element sends the first indication information to the AMF 2 network element.
  • the NEF network element determines the corresponding AMF 2 based on the information of the area that is in the VPLMN and that the terminal device is allowed to access.
  • a service area of the AMF 2 is included in the area that is in the VPLMN and that the terminal device is allowed to access.
  • the NEF network element may find an identifier of the AMF 2 based on a network topology.
  • the NEF network element sends the first indication information to the AMF 2 network element.
  • the NEF network element sends the first notification message to the AMF 2, where the first notification message includes the first indication information.
  • the first notification message may further include at least one of the following content: the identification information of the HPLMN, the information of the area that is in the VPLMN and that the terminal device is allowed to access, and the policy information by using which the UE accesses the VPLMN. For details, refer to the descriptions of 402.
  • the OAM network element in step 402 may further find the identifier of the AMF 2 based on the network topology, and directly send the first indication information to the AMF 2.
  • the AMF 2 network element sends the first indication information to the RAN 2.
  • the AMF 2 network element determines the corresponding RAN 2 based on the information of the area that is in the VPLMN and that the terminal device is allowed to access.
  • a service area of the RAN 2 is included in the area that is in the VPLMN and that the terminal device is allowed to access.
  • the AMF 2 network element may find an identifier of the RAN 2 based on the network topology.
  • the AMF 2 network element sends the first indication information to the RAN 2.
  • the AMF 2 network element sends the first notification message to the RAN 2.
  • the first notification message may further include at least one of the following content: the identification information of the HPLMN, the information of the area that is in the VPLMN and that the terminal device is allowed to access, and the policy information by using which the UE accesses the VPLMN.
  • the identification information of the HPLMN the information of the area that is in the VPLMN and that the terminal device is allowed to access
  • the policy information by using which the UE accesses the VPLMN For details, refer to the descriptions of 402.
  • the RAN 2 network element sends a notification message to the UE.
  • the RAN 2 after receiving the first indication information, the RAN 2 sends a broadcast message to the UE based on the first indication information.
  • the notification message is the broadcast message.
  • the broadcast message includes the first indication information.
  • the broadcast message further includes at least one of the following content: the identification information of the HPLMN, the information of the area that is in the VPLMN and that the terminal device is allowed to access, and the policy information by using which the UE accesses the VPLMN.
  • the identification information of the HPLMN the information of the area that is in the VPLMN and that the terminal device is allowed to access
  • the policy information by using which the UE accesses the VPLMN For details, refer to the descriptions of 402.
  • the UE selects the VPLMN
  • the UE after the UE receives the broadcast message, if an HPLMN in the broadcast message is the same as an HPLMN to which the UE belongs, the UE selects to access the VPLMN by using corresponding policy information.
  • the UE selects to access the VPLMN based on a priority rank of the VPLMN. For another example, if the policy information includes an access technology type, the UE accesses the VPLMN by using a corresponding access technology type.
  • the UE sends a registration request message to the AMF 2 in the VPLMN
  • the UE may access the VPLMN having a dynamic roaming agreement with the HPLMN
  • an embodiment shown in FIG. 5 provides a method for returning, by the UE, from the VPLMN to the HPLMN. Specifically, the method includes the following steps.
  • the UE After the fault occurs in the HPLMN, the UE cannot access the HPLMN, and the UE may successfully access the VPLMN by using the method in the embodiment shown in FIG. 4 .
  • the UE may successfully access the VPLMN by using the method in the embodiment shown in FIG. 4 .
  • the OAM network element sends second indication information to the NEF network element.
  • the VPLMN When the VPLMN learns that the fault in the HPLMN is recovered, the VPLMN deactivates the dynamic roaming agreement between the VPLMN and the HPLMN, and forbids the UE in the HPLMN to access the VPLMN.
  • the OAM network element obtains a second notification message by using a third party or directly from the HPLMN.
  • the second notification message includes the second indication information.
  • the second indication information is used to indicate to deactivate the dynamic roaming agreement between the HPLMN and the VPLMN.
  • the second notification message may further include the identification information of the HPLMN.
  • the VPLMN to which the UE is disallowed to roam can be determined by using the identification information of the HPLMN
  • the second notification message further include information of an area that is in the VPLMN and that the terminal device is not allowed to access.
  • the information of the area that is in the VPLMN and that the terminal device is not allowed to access may be a tracking area identifier list (TA list), and the list includes one or more tracking area identifiers.
  • TA list tracking area identifier list
  • the NEF network element sends the second indication information to the AMF 2 network element.
  • the NEF network element determines the corresponding AMF 2 based on the information of the area that is in the VPLMN and that the terminal device is not allowed to access.
  • the service area of the AMF 2 is included in the area that is in the VPLMN and that the terminal device is not allowed to access.
  • the NEF network element may find an identifier of the AMF 2 based on a network topology.
  • the NEF network element sends the second indication information to the AMF 2 network element.
  • the NEF network element sends the second notification message to the AMF 2, where the second notification message includes the second indication information.
  • the second notification message may further include at least one of the following content: the identification information of the HPLMN and the information of the area that is in the VPLMN and that the terminal device is not allowed to access. For details, refer to the descriptions of 504.
  • the OAM network element in step 504 may further find the identifier of the AMF 2 based on the network topology, and directly send the second indication information to the AMF 2.
  • the AMF 2 network element sends the second indication information to the RAN 2.
  • the AMF 2 network element determines the corresponding RAN 2 based on the information of the area that is in the VPLMN and that the terminal device is not allowed to access.
  • the service area of the RAN 2 is included in the area that is in the VPLMN and that the terminal device is not allowed to access.
  • the AMF 2 network element may find the identifier of the RAN 2 based on the network topology.
  • the AMF 2 network element sends the second indication information to the RAN 2.
  • the AMF 2 network element sends the second notification message to the RAN 2.
  • the second notification message may further include at least one of the following content: the identification information of the HPLMN and the information of the area that is in the VPLMN and that the terminal device is not allowed to access. For details, refer to the descriptions of 504.
  • the RAN 2 network element sends the second notification message to the UE.
  • the RAN 2 after receiving the second indication information, the RAN 2 sends a broadcast message to the UE based on the second indication information.
  • the second notification message is the broadcast message.
  • the broadcast message includes the second indication information.
  • the broadcast message further includes at least one of the following content: the identification information of the HPLMN and the information of the area that is in the VPLMN and that the terminal device is not allowed to access. For details, refer to the descriptions of 504.
  • the UE sends a deregistration request message to the AMF 2.
  • the UE after the UE receives the broadcast message, if an HPLMN in the broadcast message is the same as an HPLMN of the UE, the UE learns, based on the second indication information, that the dynamic roaming agreement between the HPLMN and the VPLMN is deactivated. Therefore, the UE sends the deregistration request message to the AMF 2, to trigger the UE to detach from the VPLMN
  • the UE selects the HPLMN.
  • the UE learns, based on the second indication information, that the dynamic roaming agreement between the HPLMN and the VPLMN is deactivated.
  • the UE may select, based on a PLMN selection list stored in the UE, to access the HPLMN.
  • the UE sends a registration request message to the AMF 1 in the HPLMN.
  • the UE may return to the HPLMN from the VPLMN
  • an embodiment shown in FIG. 6 provides another method for returning, by the UE, from the VPLMN to the HPLMN. Specifically, the method includes the following steps.
  • the AMF 2 network element sends the deregistration request message to the RAN 2.
  • the AMF 2 network element determines whether an HPLMN corresponding to UE currently registered with the AMF 2 is the same as the HPLMN included in the second notification message. If the HPLMN corresponding to UE currently registered with the AMF 2 is the same as the HPLMN included in the second notification message, the AMF 2 network element determines, based on the information of the area that is in the VPLMN and that the terminal device is not allowed to access included in the second notification message, whether a current location of the UE belongs to the area. If the current location of the UE belongs to the area, the AMF 2 initiates a deregistration procedure to the UE. Specifically, the AMF 2 network element sends the deregistration request message to the RAN 2. The deregistration request message includes the second indication information.
  • the deregistration request message may further include at least one of the following content: the information of the area that is in the VPLMN and that the terminal device is not allowed to access. For details, refer to the descriptions of 504.
  • the RAN 2 network element sends the deregistration request message to the UE.
  • the RAN 2 after receiving the deregistration request message, the RAN 2 sends the deregistration request message to the UE.
  • the deregistration request message includes the second indication information.
  • the UE After receiving the deregistration request message, the UE learns, based on the second indication information, that the dynamic roaming agreement between the HPLMN and the VPLMN is deactivated. Therefore, the UE detach from the VPLMN
  • the UE may alternatively return to the HPLMN from the VPLMN
  • the PLMN selection list stored in the UE may include information of a dynamic roaming PLMN, as shown in Table 1.
  • network selection priorities of PLMNs are represented in descending order from 1 to 6.
  • a PLMN ranking "1" corresponds to the highest network selection priority
  • a PLMN ranking "6" corresponds to the lowest network selection priority.
  • the HPLMN or EHPLMN has the highest priority.
  • the user controlled PLMN has the secondary highest priority.
  • Table 1 may further include an access technology type corresponding to the user controlled PLMN.
  • the operator controlled PLMN has a third highest priority.
  • Table 1 may further include an access technology type corresponding to the operator controlled PLMN.
  • the dynamic roaming PLMN refers to the second PLMN.
  • the dynamic roaming PLMN has a fourth highest priority.
  • the terminal device After obtaining information of the second PLMN, the terminal device stores the information of the second PLMN in the dynamic roaming PLMN
  • the PLMN selected based on the quality of service requirement has the fifth highest priority.
  • the PLMN selected based on the quality of service requirement means that the terminal device selects, based on signal quality and/or an access technology type of each PLMN, a PLMN that satisfies the quality of service requirement.
  • the information of the second PLMN (that is, the dynamic roaming PLMN in Table 1) is added to Table 1 only after the UE obtains the information of the second PLMN. It may be understood as: the dynamic roaming PLMN in Table 1 is dynamically generated by the terminal device based on the received information of the dynamic roaming PLMN. Before the UE obtains the information of the second PLMN, the PLMN selection list of the terminal device does not include the information of the second PLMN, that is, Table 1 does not include the information of the second PLMN. In this case, the terminal device does not consider the information of the second PLMN in a network selection process.
  • content in the foregoing Table 1 may be stored in a subscriber identity module (Subscriber Identity Module, SIM) of the terminal device.
  • SIM Subscriber Identity Module
  • the terminal device may sequentially select, based on the priorities of the PLMNs in Table 1, corresponding PLMNs to access.
  • FIG. 7 is a schematic diagram of a communication apparatus according to an embodiment of this application.
  • the communication apparatus includes a processing unit 701, a receiving unit 702, and a sending unit 703.
  • the communication apparatus may further include a storage unit 704.
  • the processing unit 701, the receiving unit 702, the sending unit 703, and the storage unit 704 may be physically separated units, or may be integrated into one or more physical units. This is not limited herein.
  • the receiving unit 702 and the sending unit 703 are configured to exchange content between the processing unit 701 and another unit or network element.
  • the sending unit 703 may be a transmit circuit or a transmitter.
  • the receiving unit 702 may be a receiving circuit or a receiver.
  • the sending unit 703 and the receiving unit 702 may alternatively be a transceiver of the communication apparatus.
  • the sending unit 703 and the receiving unit 702 may alternatively be a communication interface or a transceiver circuit of the processing unit 701.
  • the sending unit 703 and the receiving unit 702 may alternatively be a transceiver chip.
  • FIG. 7 shows only one sending unit 703 and one receiving unit 702, the communication apparatus may alternatively include a plurality of sending units 703 and a plurality of receiving units 702.
  • the sending unit 703 and the receiving unit 702 may alternatively be a subunit of one or more transceiver units.
  • the processing unit 701 is used by the communication apparatus to process data.
  • the processing unit 701 may be a processing circuit or may be a processor.
  • the processor may be a central processing unit (central processing unit, CPU), a network processor (network processor, NP), or a combination of a CPU and an NP.
  • the processor may further include a hardware chip.
  • the hardware chip may be an application-specific integrated circuit (application-specific integrated circuit, ASIC), a programmable logic device (programmable logic device, PLD), or a combination thereof.
  • the PLD may be a complex programmable logic device (complex programmable logic device, CPLD), a field-programmable gate array (field-programmable gate array, FPGA), a generic array logic (Generic Array Logic, GAL), or any combination thereof.
  • complex programmable logic device complex programmable logic device, CPLD
  • field-programmable gate array field-programmable gate array
  • GAL Generic Array Logic
  • FIG. 7 shows only one processing unit 701, the communication apparatus may further include a plurality of processing units, or the processing unit 701 includes a plurality of data processing subunits.
  • the processor may be a single-core (single-CPU) processor, or may be a multi-core (multi-CPU) processor.
  • the storage unit 704 is configured to store computer instructions executed by the processing unit 701.
  • the storage unit 704 may be a storage circuit or may be a memory.
  • the memory may be a volatile memory or a non-volatile memory, or may include both a volatile memory and a non-volatile memory.
  • the non-volatile memory may be a read-only memory (read-only memory, ROM), a programmable read-only memory (programmable ROM, PROM), an erasable programmable read-only memory (erasable PROM, EPROM), an electrically erasable programmable read-only memory (electrically EPROM, EEPROM), or a flash memory.
  • the volatile memory may be a random access memory (random access memory, RAM) used as an external buffer.
  • the storage unit 704 may be a unit independent of the processing unit 701, or may be a storage unit in the processing unit 701. This is not limited herein. Although FIG. 7 shows only one storage unit, the communication apparatus may alternatively include a plurality of storage units, or the storage unit includes a plurality of storage subunits.
  • the processing unit 701 may exchange content with another network element by using the sending unit 703 and the receiving unit 702. For example, the processing unit 701 obtains or receives content from the another network element.
  • the processing unit 701, the sending unit 703, the receiving unit 702, and the storage unit 704 may be connected to each other by using a bus.
  • the bus may be a peripheral component interconnect (peripheral component interconnect, PCI) bus or an extended industry standard architecture (extended industry standard architecture, EISA) bus, or the like.
  • PCI peripheral component interconnect
  • EISA extended industry standard architecture
  • the bus may be classified into an address bus, a data bus, a control bus, or the like.
  • the communication apparatus may be the terminal device in embodiments in FIG. 3 to FIG. 6 .
  • the communication apparatus includes: a processing unit, configured to enable the communication apparatus to access a second PLMN when the communication apparatus cannot access a first PLMN, where a dynamic roaming agreement between the second PLMN and the first PLMN is activated; a receiving unit, configured to receive indication information from the second PLMN, where the indication information is used to indicate to deactivate the dynamic roaming agreement between the second PLMN and the first PLMN; and a sending unit, configured to send an access request message to the first PLMN based on the indication information.
  • the receiving unit is configured to receive a broadcast message from the second PLMN, where the broadcast message includes the indication information.
  • the broadcast message further includes identification information of the first PLMN, and/or information of an area that is in the second PLMN and that the communication apparatus is not allowed to access.
  • the processing unit is further configured to deregister the communication apparatus from the second PLMN
  • the receiving unit is configured to receive a deregistration request message from the second PLMN, where the deregistration request message includes the indication information.
  • the deregistration request message further includes information of an area that is in the second PLMN and that the communication apparatus is not allowed to access.
  • the receiving unit is further configured to: before the communication apparatus accesses the second PLMN, receive, from the second PLMN, indication information used to indicate to activate the dynamic roaming agreement between the second PLMN and the first PLMN
  • the receiving unit is further configured to obtain information of the second PLMN before the communication apparatus accesses the second PLMN
  • the information of the second PLMN further includes at least one of the following information: an access technology type by using which the communication apparatus is allowed to access the second PLMN, information of an area that is in the second PLMN and that the communication apparatus is allowed to access, or priority information of the second PLMN
  • the second PLMN and the first PLMN have a same mobile country code, and a mobile network code of the second PLMN is different from a mobile network code of the first PLMN
  • the dynamic roaming agreement between the second PLMN and the first PLMN includes: if the communication apparatus can access the first PLMN, a roaming agreement between the second PLMN and the first PLMN is deactivated; if the communication apparatus cannot access the first PLMN, a roaming agreement between the second PLMN and the first PLMN is activated.
  • the first PLMN is a home public land mobile network HPLMN
  • the second PLMN is a visited public land mobile network VPLMN
  • the receiving unit 702 is configured to perform a signal receiving operation of the terminal device in embodiments in FIG. 3 to FIG. 6 .
  • the sending unit 703 is configured to perform a signal sending operation of the terminal device in embodiments in FIG. 3 to FIG. 6 .
  • the processing unit 701 is configured to perform a signal processing operation of the terminal device in embodiments in FIG. 3 to FIG. 6 .
  • the processing unit 701 enables, based on the computer instructions stored in the storage unit 704, the communication apparatus to perform the operations of the terminal device in embodiments of FIG. 3 to FIG. 6 .
  • the communication apparatus may alternatively be an access management network element.
  • the communication apparatus may include: a receiving unit, configured to obtain first indication information when a terminal device cannot access a first PLMN, where the first indication information is used to indicate to activate a dynamic roaming agreement between a second PLMN and the first PLMN, and the communication apparatus is an apparatus in the second PLMN; and a sending unit, configured to send the first indication information to the terminal device.
  • the receiving unit is configured to obtain a first notification message, where the first notification message includes the first indication information.
  • the first notification message further includes information of the first PLMN, and the information of the first PLMN includes identification information of the first PLMN
  • the first notification message further includes at least one of the following information: an access technology type by using which the terminal device is allowed to access the second PLMN, information of an area that is in the second PLMN and that the terminal device is allowed to access, or priority information of the second PLMN
  • the communication apparatus further includes a processing unit, configured to determine an access network device based on the information of the area that is in the second PLMN and that the terminal device is allowed to access, where the access network device is located in the area that is in the second PLMN and that the terminal device is allowed to access.
  • the receiving unit is configured to obtain the first notification message from a network management network element by using a network exposure function network element in the second PLMN
  • the receiving unit is further configured to obtain second indication information, where the second indication information is used to indicate to deactivate the dynamic roaming agreement between the second PLMN and the first PLMN; and the sending unit is further configured to send the second indication information to the terminal device by using the access network device.
  • the communication apparatus may alternatively be the access management network element in FIG. 4 to FIG. 6 , for example, the AMF 1 or the AMF 2.
  • the receiving unit 702 is configured to perform a signal receiving operation of the AMF network element in embodiments of FIG. 4 to FIG. 6 .
  • the sending unit 703 is configured to perform a signal sending operation of the AMF network element in embodiments of FIG. 4 to FIG. 6 .
  • the processing unit 701 is configured to perform a signal processing operation of the AMF network element in embodiments of FIG. 4 to FIG. 6 .
  • FIG. 4 to FIG. 6 For details, refer to the descriptions of embodiments of FIG. 4 to FIG. 6 .
  • the processing unit 701 enables, based on the computer instructions stored in the storage unit 704, the communication apparatus to perform the operations of the AMF network element in embodiments of FIG. 4 to FIG. 6 .
  • FIG. 8 is a schematic diagram of another communication apparatus according to an embodiment of this application.
  • the communication apparatus includes at least one processor 801, a transceiver 802, and a memory 803.
  • the at least one processor 801, the transceiver 802, and the memory 803 are connected by using a communication line 804.
  • the processor 801 may be a CPU, a microprocessor, an ASIC, or one or more integrated circuits configured to control program execution in solutions of this application.
  • the memory 803 is configured to store computer-executable instructions for executing the solution of this application, and the processor 801 controls execution of the computer-executable instructions.
  • the processor 801 is configured to execute the computer-executable instructions stored in the memory 803, to implement the operations of the terminal device or the AMF network element in embodiments in FIG. 3 to FIG. 6 of this application.
  • the computer-executable instructions in this embodiment of this application may also be referred to as application program code. This is not specifically limited in this embodiment of this application.
  • the processor 801 may include one or more CPUs, for example, a CPU 0 and a CPU 1 in FIG. 7 .
  • the processor 801 may be a single-core (single-CPU) processor, or may be a multi-core (multi-CPU) processor.
  • FIG. 9 is a schematic structural diagram of a chip or a chip system according to an embodiment of this application.
  • the chip includes one or more (including two) processors 901 and a communication interface 902.
  • the chip or the chip system may further include a memory 903.
  • the memory 903 may include a read-only memory and a random access memory, and provide operation instructions and data for the processor 901.
  • the memory 903 stores the following elements: an execution module or a data structure, a subset thereof, or an extended set thereof.
  • the operation instructions (the operation instructions may be stored in an operating system) stored in the memory 903 are invoked to control the terminal device or the AMF network element in embodiments in FIG. 3 to FIG. 6 to perform corresponding operations.
  • All or some of the foregoing embodiments may be implemented by using software, hardware, firmware, or any combination thereof.
  • the software is used to implement embodiments, all or some of embodiments may be implemented in a form of a computer program product.
  • the computer program product includes one or more computer programs or instructions.
  • the computer programs or the instructions are loaded and executed on a computer, all or some of the procedure or functions according to embodiments of this application are implemented.
  • the computer may be a general-purpose computer, a dedicated computer, a computer network, a network device, user equipment, or another programmable apparatus.
  • the computer programs or the instructions may be stored in a computer-readable storage medium, or may be transmitted from a computer-readable storage medium to another computer-readable storage medium.
  • the computer programs or the instructions may be transmitted from a website, computer, server, or data center to another website, computer, server, or data center in a wired or wireless manner.
  • the computer-readable storage medium may be any usable medium accessible by a computer, or a data storage device, such as a server or a data center, integrating one or more usable media.
  • the usable medium may be a magnetic medium, for example, a floppy disk, a hard disk, or a magnetic tape, may be an optical medium, for example, a digital video disc (digital video disc, DVD), or may be a semiconductor medium, for example, a solid-state drive (solid-state drive, SSD).

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Databases & Information Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
EP19958640.5A 2019-12-30 2019-12-30 Procédé et appareil d'itinérance, et système Pending EP4064763A4 (fr)

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PCT/CN2019/129833 WO2021134175A1 (fr) 2019-12-30 2019-12-30 Procédé et appareil d'itinérance, et système

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US12089289B2 (en) * 2020-10-29 2024-09-10 Tracfone Wireless, Inc. System and process for configuring a dynamic roaming public land mobile network (PLMN)
WO2024108502A1 (fr) * 2022-11-24 2024-05-30 Oppo广东移动通信有限公司 Procédé de communication et appareil de communication

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CN100396150C (zh) * 2004-11-25 2008-06-18 华为技术有限公司 一种公共陆地移动网络的重选方法
US8417243B2 (en) * 2010-10-21 2013-04-09 Telefonaktiebolaget Lm Ericsson (Publ) Enhanced reliability of service in mobile networks
CN103841546B (zh) * 2012-11-22 2019-04-16 中兴通讯股份有限公司 一种移动终端使用漫游本地业务的方法、系统及装置
US9668183B2 (en) * 2014-09-02 2017-05-30 Samsung Electronics Co., Ltd. System and method for enabling quick recovery of services from a forbidden PLMN
KR102501498B1 (ko) * 2015-05-15 2023-02-21 삼성전자주식회사 사용자 단말의 e-utran 능력을 관리하는 방법
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US10681531B2 (en) * 2017-11-01 2020-06-09 Apple Inc. Selection between home and visiting networks
WO2019122494A1 (fr) * 2017-12-20 2019-06-27 Nokia Technologies Oy Procédé et appareil de résilience aux catastrophes dans des réseaux mobiles
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EP4064763A4 (fr) 2022-11-30
WO2021134175A1 (fr) 2021-07-08

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